And why not? You've only been here since Tuesday, how can you claim being 'fed up with Impa discussion' already?
Ghirahim discussion has died out a long time ago. People have realised that after getting Yuga, there's no need to keep supporting all these minor villains from Zelda. Even Vaati is highly unlikely, despite appearing most as a villain after Ganondorf. How come Ghirahim has any chance you think? If you argue Skyward Sword was relevant when Sakurai made the decisions, why wouldn't he choose Impa over Ghirahim you think?